Romans 7:9, How then can I be saved?
The Apostle Paul before his conversion did not truly understand the significance of the moral law. He thought he could keep the law and be saved by it. He was mistaken. After his conversion, he realized the law was given so that the sinful nature of man is aroused causing him to sin. The law, properly applied, was meant to expose one’s sinfulness. This would cause the person to realize his inability to be saved through keeping the law and come to Christ.